public class Test3 {
    public static void main(String[] args) {
        String str1 = "hello";
        String str2 = "hello";
        String str3 = new String("hello");
        String str4 = new String("hello");
        String str5 = "hellohello";
        String str6 = str1 + str2;
        System.out.println(str1 == str2);
        System.out.println(str2 == str3);
        System.out.println(str3 == str4);
        System.out.println(str2.equals(str3));
        System.out.println(str3.equals(str4));
        System.out.println(str5.equals(str6));
        System.out.println(str5 == str6);

    }
}
